Three assailants have attacked Microsoft headquarters in Athens early on Wednesday morning, setting off a bomb after reversing through the main entrance. There were no injuries police have confirmed.

The burnt out van was still being examined by forensics late on Wednesday morning.

The Telegraph is reporting that early on Wednesday morning 3 assailants forced two security guards out of the building located in the Maroussi suburb north of the city centre, then crashed through the entrance and set off an incendiary device inside the van that police said appeared to have consisted of camping gas canisters and several containers of gasoline.

Greece has been the target of several attacks by several small armed anarchist or domestic terrorist groups for decades, which usually target official buildings, banks or symbols of state power with small bombs or incendiary devices. Although the attacks usually occur late at night and rarely cause injuries.

No one has claimed responsibility for the attack, and there was no prior warning.